Thanks for the response. It has a caterpillar 3126 diesel engine on a Magnum chassis. I did find the plate you mentioned and it states 255/70r/22.5 front and rear so I guess I will go with 6 new 255/70R/22.5.
Thanks for your input, I appreciate the response.
Mike

I had an Itasca gas with 19.5 inch tires that I owned from 2010 until bought a "new" to me motorhome June 2017. The Itasca had brand new tires in 2010 so I never had the pleasure of deciding on new tires.
Well it is time! My Toyo M120 255/70R/22.5 front tires were manufactured 4209 and 0110
The 4 rear Toyos are M140 at 275/70R/22.5 and dates are on the inside but are older than 2010 for sure.
All tires still look great both tread and sidewalls but before I do my next 3000 mile trip I think I should replace.
My question is front tires are different width than back. Should I stay with same sizing for these positions? Or one size for all positions and if so which size?
Vehicle is a 1996 Beaver Patriot Trenton with Caterpillar engine.
Any Beaver owners know what it came from the factory with?